Finally, from so little sleeping and so much reading, his brain dried up and he went completely out of his mind. - Miguel de Cervantes

with little sleep and much reading his brains got so dry that he lost his wits.

And this denial added more flames to the fire and more ardor to our desire, because, although it silenced our tongues, it could not silence our pens, which, with greater freedom that tongues, tend to reveal to the person we love what is hidden in our soul, for often the presence of the beloved confuses and silences the most determined intention and the boldest tongue.

Mind, Sancho, I do not say that a proverb aptly brought in is objectionable; but to pile up and string together proverbs at random makes conversation dull and vulgar.

…as it seldom happens that any felicity comes so pure as not to be tempered and allayed by some mixture of sorrow.